Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea.
Advanced Institutes of Convergence Technology, Suwon-Si, Gyeonggi-do 16229, Republic of Korea.
Anal Chem. 2020 Jul 7;92(13):8776-8783. doi: 10.1021/acs.analchem.0c00142. Epub 2020 Mar 27.
The detection of ions is of critical importance for environmental, industrial, and physiological applications, where sensitive and disposable ion sensing is still challenging. Herein, we present a sensitivity-tunable ion-sensing platform based on reverse electrodialysis, which is suitable for convenient and sensitive on-site analysis of various ions. It is revealed that this sensing system does not require any external power supply, and the sensitivities can be modulated by altering the number of stacks, possibly higher than the theoretical limitation, the Nernstian slope. The sensing system is integrated with a multicolor detection system via the introduction of polyaniline as a reporting material, which enables direct quantitative analysis based on a continuous color change gradient observable with the naked eye. Overall, the adopted approach by introducing reverse electrodialysis represents remarkable progress toward self-powered and disposable ion sensors with high and easily tunable potentiometric sensitivity.
离子检测在环境、工业和生理应用中至关重要，而敏感和一次性离子传感仍然具有挑战性。在此，我们提出了一种基于反向电渗析的灵敏度可调离子传感平台，适用于各种离子的便捷和灵敏现场分析。结果表明，该传感系统不需要任何外部电源，通过改变堆叠数量可以调节灵敏度，可能高于理论极限（能斯特斜率）。通过引入聚苯胺作为报告材料，该传感系统与多色检测系统集成，可实现基于肉眼可见的连续颜色变化梯度的直接定量分析。总的来说，通过引入反向电渗析的方法代表了朝着具有高且易于调节的电位灵敏度的自供电和一次性离子传感器的显著进展。
